WO2006018922A1 - Ink composition for inkjet printing - Google Patents

Abstract

An ink composition for inkjet printing that in the printing by means of an inkjet printer, is free from nozzle clogging to thereby enable obtaining a print of desirable printing quality, and that can ensure appropriate drying rate for printing and further excels in color development. There is provided an ink composition for inkjet printing, comprising a pigment, a binder resin, a pigment dispersant and a solvent, wherein the solvent is composed of (1) at least one glycol ether and at least one of a lactone compound and 2-pyrrolidone, or (2) at least one glycol ether acetate and at least one of cyclohexanone and isophorone.

Description

 Specification

 Ink composition for inkjet printing

 Technical field

 The present invention relates to an ink composition for ink jet printing, and more specifically, since clogging of a nozzle does not occur when printing with an ink jet printer, a print which is preferable in terms of print quality is obtained, and a moderate drying speed of printing And an ink composition for ink jet printing which is excellent in color development.

 Background art

 [0002] A large number of pigment ink compositions for ink jet printing using various solvents have been conventionally proposed, but when producing a printed matter by an ink jet printer using such a pigment ink composition, the nozzles of the ink jet printer Clogging occurred, which resulted in the formation of a favorable printed matter in terms of print quality, and even when a printed matter was produced using such a pigment ink composition, the color expression was not always sufficient and strong.

 Disclosure of the invention

 The present invention has been made to solve the various problems as described above, and since a nozzle is not clogged when printing with an inkjet printer, a print having favorable print quality can be obtained. It is an object of the present invention to provide an ink composition for ink jet printing which can obtain a suitable drying speed of printing and is excellent in color development.

 The inventors of the present invention have found that excellent ink compositions for ink jet printing can be obtained by using a solvent of a specific composition as a solvent as a result of earnestly examining in order to achieve the above object, the present invention Completed.

 That is, the ink composition for inkjet printing of the present invention comprises a pigment, a binder resin, a pigment dispersant and a solvent, and the solvent is

 (1) at least one glycol ether and at least one ratato compound and at least one 2-pyrrolidone, or

(2) Consisting of at least one glycol ether acetate and at least one cyclohexanone and isophorone It is characterized by

 BEST MODE FOR CARRYING OUT THE INVENTION

 The ink composition for inkjet printing of the present invention will be specifically described below.

In the ink composition for inkjet printing of the present invention, a solvent comprising (1) at least one of glycol ether and at least one of ratatoly compound and 2-pyrrolidone, or (2) at least one of glycol ether acetate It is necessary to use a solvent consisting of a species and at least one of cyclohexanone and isophorone. The amount of the mixed solvent is determined in consideration of the viscosity, surface tension and the like of the ink composition, but it is usually 60 to 99% by mass, preferably 80 to 97% by mass of the ink composition. The amount thereof in the case of using one kind even without less of glycol ethers is 15 to 95 wt% of the ink composition, favorable Mashiku a 55-85 mass _^0/0, at least Rataton compound and 2-pyrrolidone The blending amount of one kind is 1 to 45% by mass, preferably 10 to 25% by mass of the ink composition. Further, the amount thereof in the case of using at least one of the grayed recall ether acetate is 15 to 90 mass _^0/0 of the ink sets Narubutsu, preferably 55 to 85 weight _^0/0, cyclohexanone and isophorone cyclohexane The blending amount of at least one of them is 0.5 to 30% by mass, preferably 1 to 25% by mass of the ink composition.

 As a glycol ether used in the present invention, ethylene glycol monomethyl ether, ethylene glyconol monobutyno ree tenole, diethylene glyconol mono methinolee tenole, ethylene glycol jetyl ether, diethylene glycol dimethyl ether, di ethylene glycono reethino le meth Ethylene glycol ethers such as nore tene, diethylene glycolo regetino nore tenolee, triethylene glycol monobutyl ether, propylene glycol nore mono methinolee tenole, propylene glycol noromone tine nore tenole, propylene pyrene glyconolemono Butynol ether, dipropylene glycol mono monomethyl ether, di propylene glycol monoethyl ether, propylene glycol di Chirueteru, dipropylene glycol dimethyl ether, propylene glycol Jefferies chill ether, and propylene glycol ethers such as dipropylene glycol Jefferies chill ethers and mixtures thereof.

[0008] As a rattanning compound used in the present invention, γ-petit rataton, γ- valero ratatone, γ- For example, force pro-rataton, _ε valero ratato and mixtures thereof can be mentioned.

Examples of the glycol ether acetate used in the present invention include ethylene glycol monolee norene acetate, diethyleneglycolone monolechnoree tenante acetate, ethylenegulcodonole monobutynoree tenante acetate and the like. Asseteates, Propylene Glyconololate Monomethinoleate Tenoleate Acetate, Propylene Glyconoleo Noethino Reethane Oleate Acetate, Dipropylene Glyconolole Monoethinoleate Tenoleate Acetate, Dipropylene Glyconolole Monoethinoleate Tenoleate Acetate And propylene propylene glycol monoteracetates and mixtures thereof.

[0010] The ink composition for inkjet printing of the present invention contains a Noinda resin as well as a common printing ink composition. Such binder resins are not particularly limited to any binder resin commonly used in conventional ink jet printing ink compositions, but in the present invention such binder resins are not limited. As the copolymer of vinyl chloride copolymer, which is particularly preferable as the copolymer of polyvinyl chloride, a copolymer copolymer of vinyl chloride may be used alone, but other resins may be used together with copolymer of vinyl chloride copolymer. The content of the binder resin is determined in consideration of ink adhesion, viscosity of the ink composition, surface tension and the like, but is usually 0.5 to 15% by mass of the ink composition, preferably 1 to 10 mass ^_0/0.

[0011] As the vinyl chloride copolymer resin, various ones can be used, and for example, copolymerization of vinyl chloride and other monomers such as vinyl acetate, vinyl chloride chloride, acrylic resin, and maleic acid is possible. I can mention the resin. As a preferred vinyl chloride copolymer resin, mention may be made of a polyvinyl alcohol-butyl acetate copolymer obtained by copolymerizing vinyl chloride and acetate, particularly a copolymer resin having a molecular weight of 30,000 or less.

[0012] As the above-mentioned other resins, any resins used in conventional ink compositions without particular limitation can be used. For example, epoxy resin, phenol resin, novolak resin, acrylic resin, rosin-modified phenol resin, polyester resin, amino resin such as melamine and benzoguanamine, polyamide resin, cenorelose diacetate, cenore lostoria Cenolose, nitrocenolose, cenolellose nitrate, cenolose propionate, cerolese acetate, butylate etc., cenoterose, cenoterose, methylo recenorelose, ecino recenorelose, benzinole selorelose, tritinorecenoreose, cyane Tinoresenorellose, canole boximethi Examples include senorellose ether oils such as noresenollose, canoleboschiechinoreseneroles, aminoethinoresenolerose, and coumarin acetate and the like.

 [0013] As a pigment used in the ink composition for inkjet printing of the present invention, pigment yellow 12, 13, 14, 17, 20, 24, 31, 55, 74, 83, 86, 93, 109, 110, 117 , 125, 128, 129, 137, 138, 139, 147, 148, 150, 153, 154, 155, 166, 168, 180, 181, 185, pigment orange 16, 36, 38, 43, 51, 55, 59, 61, 64, 65, 71, pigment red 9, 48, 49, 52, 53, 57, 97, 122, 123, 149, 168, 177, 180, 192, 202, 206, 215, 216, 217, 220, 223, 224, 226, 227, 228, 238, 240, 244, 254, Biggest Noletes 19, 23, 29, 30, 32, 37, 40, 50, Big Ones 15 , 15: 1, 15: 3, 15: 4, 15: 6, 22, 30, 64, 80, Pigment Green 7, 36, Big Men's Blaken 23, 25, 26, Pig Men's Bold 7, 26, 27 , 28, acid titanium, acid acid Can ultramarine, chrome yellow, zinc sulfide, cobalt blue, and a Ageruko barium sulfate and calcium carbonate. The compounding amount of the pigment can be arbitrarily determined depending on the type of pigment used, etc., but usually 0.1 to 15% by mass, preferably 0.5 to 10% by mass of the ink composition.

 As a pigment dispersant used in the ink composition for ink jet printing of the present invention, polyester polyamide resin having two or more amide groups in one molecule and having a number average molecular weight of 2,000 to 15,000 is used. It can be mentioned. The compounding amount of the pigment dispersant is a force determined by the type of the pigment used and the like, usually 0.1 to 15% by mass of the ink composition, preferably 0.5 to 10% by mass.

 [0015] A typical pigment dispersant is produced by reacting an acid-terminated polyester resin with a polyamine compound having two or more amino groups in one molecule. For example, Solsparse 3 2000, Solsparse 32500, Solsparse 32600, Solsparse 33500, Solspasse 34750, Sonoreth No 3510, Sonoress 37500, Dysnoch, 9077 can be mentioned.

 In the case where the number of amide groups is one or less in one molecule, the pigment dispersibility is unfavorably poor. When the number average molecular weight is less than 2,000, the pigment dispersion stability tends to decrease, and when the number average molecular weight exceeds 15,000, the dispersibility in the ink tends to decrease.

In addition, the ink composition for inkjet printing of the present invention may contain a conductivity modifier. The blending amount of the conductivity regulator is usually 0.1 to 10% by mass, preferably 0.5 to 5% by mass of the ink composition.

In addition, the ink yarn composition for inkjet printing of the present invention is required to have the characteristics adapted to the inkjet printing method as well as the ink composition for ordinary inkjet printing, and for that purpose, the ink 1 the viscosity of the composition: L00cP (20 ° C), the surface tension of ^{2 X 10- 2 ~6 X 10- 2} NZm, it is desirable to a 0.8 to 1 second range gravity..

 The ink composition for inkjet printing of the present invention is to stir and mix each component, and then filter and purify it with a filter having a pore size of about 1 Z 10 or less of the nozzle diameter of the inkjet printer to be used. Thus, it can be prepared.

 The ink composition for inkjet printing of the present invention can be used in various inkjet printers. As such an ink jet printer, there can be mentioned, for example, a system which ejects an ink composition by a charge control system and an ink on demand system. The ink yarn composition for ink jet printing of the present invention is suitably applied particularly to printing by a large-sized ink jet printer using a large format, for example, printing by an ink jet printer aiming to print on outdoor articles such as sign displays. it can. In addition, even in the case of drawing a single graphic print or video recording, the contrast is clear and the image reproducibility is extremely good.

 The printing surface (ink composition) after ink jet printing forms a dry film by drying at normal temperature to several hundred degrees Celsius. The base material to be printed in the present invention is not particularly limited as long as it does not deform or deteriorate under the conditions for drying the printing surface (ink composition). Examples of such a substrate include the surface of a substrate such as metal, glass and plastic, paper coated with resin on the surface, a transparent sheet for overhead projects, and outdoor articles such as sign displays. .

 By using the ink yarn composition for ink jet printing of the present invention, since clogging of the nozzle does not occur when printing with an ink jet printer, a print preferable in terms of print quality can be obtained, and the printing can be carried out properly. Drying speed is obtained, and excellent color development is obtained. Example

Hereinafter, the present invention will be described in more detail by way of examples and comparative examples. Examples 1 to 4 and Comparative Examples 1 to 3

 A mixture containing the components shown in Table 1 in the amounts (parts by mass) shown in Table 1 was kneaded with a sand mill for 3 hours to prepare inks of Examples 1 to 4 and Comparative Examples 1 to 3.

[0024] The carbon black used is Monarch 1000 (manufactured by Cabot Co., Ltd.), the chloride-co-copolymer resin is VYHD (manufactured by Dow's Chemical Co., Ltd.), and the cellulose ester resin is CAB- 55 1 -0. 01 The polyester polyamide resin was Solspers 37500 (solid content 40%) (Avicia) and Disperbic 167 (solid content 52%) (Bick ChemIl.).

The viscosity, particle diameter, dispersion stability, nozzle clogging, and ethanol resistance of the inks of Examples 1 to 4 and Comparative Examples 1 to 3 were measured by the following methods, respectively, and evaluated based on the following criteria.

<Viscosity measurement>

 It was measured at 20 ° C. using a B-type viscometer.

Particle Size Measurement

 It was measured using a laser diffraction type particle size distribution measuring device ("SALD-7000" manufactured by Shimadzu Corporation).

 <Dispersion Stability>

 After storing the ink at 60 ° C. for one month, the viscosity and particle size were measured and evaluated based on the following criteria.

 ◎: Changes in viscosity and particle size after storage for 1 month at 60 ° C are within 5% each. ○: The change in viscosity and particle size after storage for 1 month at 60 ° C is more than 5% and 10% or less. X: Any change in viscosity and particle size after storage at 60 ° C for 1 month is more than 10%.

Nozzle clogging>

 The image was printed by a large format inkjet printer, and the printing condition was visually evaluated according to the following criteria.

 :: Printing is possible at a predetermined position.

 X: Nozzle clogging occurs to cause a defect, and printing can not be performed at a predetermined position.

<エ タ ノ ー ル ethanolicity>

Print the image with a large format inkjet printer, 50% ethanol water The image was rubbed with a cloth soaked in water and evaluated visually.

 ◎: No change at all.

 :: One composition ink part peels off.

 X: The ink is peeled off and the substrate can be seen.

 The results of their measurement and determination were as shown in Table 1.

[Table 1] Lidopi 2nd-

 Petit Trakunro-

 Chichi Tomerelle / Eno

 X X X X プ グ ピ リ ピ リ チ ル ル モ ル ル

 Dimension Jiguchi chili chime terreru レ レ エ コ ノ ノ ノ X X 塩 salt polymerization co-resin building

 O

 〇 X 脂 脂 テ セ ル レ エ ロ エ ロ ノ ー

 o Popo (Lido resin) Teripamia Solor 37500 Sussuye

 寸 寸 寸 寸

 Popo resin (de) Lilydopactemibiaru 167 Susuei

 Yes

 Degree) viscosity (Pm a · s O ®)

() Translation mu

 ο O

 1 寸 Size Dispersion stability 分散

○ Clogged Nor Dimensions ® ○ © Tolerance Tanora

As is clear from the data shown in Table 1, the inks of Examples 1 to 4 of the present invention gave good evaluation results for each test item, and good inks were obtained.

 On the other hand, in the ink of Comparative Example 1 in which the mixed solvent outside the scope of the present invention was used, nozzle clogging occurred and printing became defective. In addition, in the ink of Comparative Example 2 in which only one of the two types of essential solvents in the present invention was used, nozzle clogging with poor dispersion stability occurred, and printing became poor. Furthermore, the ink of Comparative Example 3 using only one of the other two types of solvents essential in the present invention has poor dispersion stability and poor ethanol resistance, causing nozzle clogging, and printing. Was bad.

 Examples 5 to 8 and Comparative Examples 4 to 6

 The ink compositions of Examples 5 to 8 and Comparative Examples 4 to 6 were prepared by kneading each mixture containing the components shown in Table 2 in the amounts (parts by mass) shown in Table 2 with a sand mill for 3 hours. .

 The carbon black used is Nipex 170 IQ (made by Dedasa), the vinyl chloride copolymer resin is VYHD (made by Dow Chemical Co.), and the cellulose ester resin is CAB-5 51 -0. 01 The polyester polyamide resin was Solsparse 32 000 (solid content concentration 100%) (Avicia) and Disperbic 9077 (solid content concentration 9 9%) (Bick Chem. I.) .

 In the ink compositions of Examples 5 to 8 and Comparative Examples 4 to 6, the viscosity, the particle size, the dispersion stability, the nozzle clogging, and the ethanol resistance were measured by the above-mentioned methods, respectively, Rated it. The measurement results and evaluation results are as shown in Table 2.

[Table 2]

Yes

 to 10 X X X

00 -—)

 Composition Ikun

 σ ι 卜

 CD

 Dimension co X X 00 f

 ο (M

 Bob Cara Chun O

 Dimension D O

 M X X 〇

 co

 To Sakuxinon mouth

 Yes

 CO size iso phone D

 Dimensions 〇 チ Chichi to Merlenno

 en

 σ 00

 Gupupilichitometetetelerenoanremorerokononoenoichi 1 1 CD 〇 〇 グ プ リ グ Guripichitote Setenoren Remorale econoenono e e H

 «○ O

 Dimensions

 O © 塩 © Salt polymerization resinification

 O o

 Resin Tecerelssuenoen

 (i ポ © © Popo resin (Dopa) Lilimi Theaso 3 2000 Sullus Suay

 Depopo) Lido resin (Teripabia Miku 907 Le 7 Susue

 ) Degree (glossy Pma · s

 () Particle size mn

 Fixed discount

 詰 ノ ル ノ ル

 Resistant tanor

As apparent from the data shown in Table 2, the inks of Examples 5 to 8 of the present invention gave good evaluation results for each test item, and good inks were obtained.

On the other hand, in the ink of Comparative Example 4 using a mixed solvent outside the scope of the present invention, nozzle clogging occurred and printing became defective. In addition, the ink of Comparative Example 5 using only one of the two types of solvents essential in the present invention had poor dispersion stability, nozzle clogging occurred, and printing was poor. became. Furthermore, the ink of Comparative Example 6 using only one of the other two solvents essential in the present invention has poor dispersion stability and poor ethanol resistance, causing nozzle clogging, and printing. Was bad.

Claims

[1] Pigment, binder resin, pigment dispersant, and solvent power, wherein the solvent is  (1) at least one glycol ether and at least one ratato compound and at least one 2-pyrrolidone, or  (2) Consisting of at least one glycol ether acetate and at least one cyclohexanone and isophorone  An ink yarn composition for ink jet printing characterized in that [2] The ink composition for ink jet printing according to claim 1, wherein the noinda resin is a salt-cobalt copolymer resin.  [3] The ink composition for ink jet printing according to claim 1 or 2, wherein the pigment dispersant is a polyester polyamide resin having two or more amide groups in one molecule and having a number average molecular weight of 2,000 to 15,000. object.  [4] The inkjet according to claim 1, 2 or 3, wherein the glycol ether is (di) ethylene glycol (di) alkyl ether, (di) propylene glycol (di) alkyl ether, or triethylene glycol monoalkyl ether. Printing ink composition. [5] The ink thread composition for ink jet printing according to claim 1, 2 or 3, wherein the glycol ether acetate is propylene glycol monomethyl ether acetate or ethylene glycol monobutyl ether acetate.